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This procedure is used to initialize a Multitech ZDX Modem. The
first procedure is for enabling the modem for dialin, and the
second is to set the modem up for dial out. There are not many
differences, but they are important.
- Enabling a modem for dialin under CDOS:
- The following commands(less their comments) need to be sent to
the modem. The easiest way to do this would be to set the port as
an AUX port and use ADUMB to initialize the modem. Set
handshaking to none for this exercise. Don't forget to use the
AUX command to use the correct AUX port the modem is connected
to. COM1 is AUX0, COM2 is AUX1, and the first Addon Port is AUX2.
You should see an OK after hitting return for each command as an
indicator that the modem understood the command.
- AT&F0 (Reset the modem to it's factory defaults)
- ATQ1 (Result codes suppressed)
- ATS0=1 (Answer on first ring)
- AT&C1 (DCD tracks carrier)
- AT&D3 (When DTR drops, drop carrier)
- ATS10=10 (Used if call waiting is on phone line)
- AT$SB19200 (Set baud rate for modem)
- ATE0 (Turn off command echoing. At this time, you will no
longer
see characters echoed back)
- AT&W0 (Store current settings in NVRAM)
Once you have configured the modem don't forget to enable RTS and
CTS handshaking for the port, as that is what we set the modem up
for.
- Configuring a modem for dialout using CCITERM:
The following commands(less their comments) need to be sent to
the modem. The easiest way to do this would be to set the port as
an AUX port and use ADUMB to initialize the modem. Set
handshaking to none for this exercise. Don't forget to use the
AUX command to use the correct AUX port the modem is connected
to. COM1 is AUX0, COM2 is AUX1, and the first Addon Port is AUX2.
You should see an OK after hitting return for each command as an
indicator that the modem understood the command.
- AT&F0 (Reset the modem to it's factory defaults)
- ATQ1 (Result codes suppresedr)
- ATS0=0 (Never answer the phone)
- AT&C1 (DCD tracks carrier)
- AT&D3 (When DTR drops, drop carrier)
- ATS10=10 (Used if call waiting is on phone line)
- AT$MB19200 (Set baud rate for modem)
- ATE0 (Turn off command echoing.)
- AT&W0 (Store current settings in NVRAM)
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